The Collaborative International Dictionary of English v.0.48:

Infraction \In*frac"tion\, n. [L. infractio: cf. F. infraction.]
   The act of infracting or breaking; breach; violation;
   nonobservance; infringement; as, an infraction of a treaty,
   compact, rule, or law. --I. Watts.
   [1913 Webster]

WordNet (r) 3.0 (2006):

infraction
    n 1: a crime less serious than a felony [syn: misdemeanor,
         misdemeanour, infraction, violation, infringement]